A customer ordered a cup of coffee in a restaurant! The waiter served the coffee. The customer found a fly in the coffee. He called the waiter. 

Customer: How do I drink this coffee!
Waiter: Don’t you know how to drink a coffee? 
Customer: Waiter, see, there is a fly in my coffee. 
Waiter: Oh yes sir, you are right! There is a fly in your coffee. 
Customer: Waiter, I said, there is a fly in MMY coffee (He stressed the word MY)
Waiter: Oh don’t worry sir, the fly won’t drink much! 
Customer: Waiter, it is swimming in my coffee. 
Waiter:  Sir, do you want me to get a lifeguard for the fly sir? 
(Annoyed) Customer: the fly dead, it’s irritating! 
Waiter: I guess, it doesn’t know how to swim properly. 
Customer: How do I drink this coffee? 
Waiter: Don’t you know how to drink? I will teach you! 

He drank the coffee! And said, this is how you should drink a coffee.